dehmmy
join:2004-11-20
Bethesda, MD
| reply to NormanS
Re: [E-Mail] SMTP.rcn.com silently not relaying, again
said by NormanS  :said by dehmmy :said by kshakir :You can hack around the port 25 restriction by using a third party server on another port... Or you could input an invalid IP which you'd never send smtp to thus allowing outgoing port 25 (smtp) to any IP but I thought the first example was funnier. Just trying to figure out how that would work. just put in the Reply-To: line yourname@company.com which will tell the receiving party to reply to that address...
Not really a satisfactory solution. And a bunch of us, whose ISP gave us Yahoo! mail servers to use, are beating up both our ISP, and Yahoo!, over a similar restriction imposed by Yahoo!. Yeah, they should at least have deep packet inspection to auto cut would be spammers instead of forcing you to use their smtp.. i agree
jay |
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NormanS
Premium,MVM
join:2001-02-14
San Jose, CA
 ·Pacific Bell - SBC
| said by dehmmy :Yeah, they should at least have deep packet inspection to auto cut would be spammers instead of forcing you to use their smtp.. i agree They aren't forcing you to use their SMTP server. They aren't blocking message submission ports; that I know of. It is just that, when using their SMTP server, they shouldn't care what your "From:" email address is.
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Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum |
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dehmmy
join:2004-11-20
Bethesda, MD
| said by NormanS :said by dehmmy :Yeah, they should at least have deep packet inspection to auto cut would be spammers instead of forcing you to use their smtp.. i agree They aren't forcing you to use their SMTP server. They aren't blocking message submission ports; that I know of. It is just that, when using their SMTP server, they shouldn't care what your "From:" email address is. Well, in my area at least they block all outgoing port 25 sessions unless it's to one of their smtp servers thus forcing you to use it and no one elses.
jay |
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NormanS
Premium,MVM
join:2001-02-14
San Jose, CA
·Pacific Bell - SBC
| said by dehmmy :Well, in my area at least they block all outgoing port 25 sessions unless it's to one of their smtp servers thus forcing you to use it and no one elses. Unless they are also blocking ports 465 and 587, they are not preventing users from accessing any other mail servers.
I refer you to the list of mail servers I use, several posts up, none of which are blocked by blocking port 25.
--
Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum |
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rcnman
Jason Nealis
Premium,VIP
join:2003-05-02
Herndon, VA
| reply to dehmmy
said by dehmmy :said by NormanS :said by dehmmy :Yeah, they should at least have deep packet inspection to auto cut would be spammers instead of forcing you to use their smtp.. i agree They aren't forcing you to use their SMTP server. They aren't blocking message submission ports; that I know of. It is just that, when using their SMTP server, they shouldn't care what your "From:" email address is. Well, in my area at least they block all outgoing port 25 sessions unless it's to one of their smtp servers thus forcing you to use it and no one elses. jay This is done in order to control outbound spam from zombies on the network. If you want to get around this block you can purchase a static IP that will open port 25. |
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NormanS
Premium,MVM
join:2001-02-14
San Jose, CA
·Pacific Bell - SBC
| said by rcnman :This is done in order to control outbound spam from zombies on the network. If you want to get around this block you can purchase a static IP that will open port 25. Or, if you are using a Gmail account, use either port 587, or port 465. RCN shouldn't be blocking those ports. You should be able to use *any* message submission server which listens on a proper message submission port. There is no law of nature, or Congress, which requires that message submission must use port 25.
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Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum |
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jsolo1
join:2001-07-01 | Perhaps if all servers required authentication, port 25 could be left open. No credentials, no smtp.
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Insanity is living in a state of disillusion. |
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negativeduck
Premium,VIP
join:2002-02-14
Centreville, VA
| You can infact relay mail from any mail-client as user@anydomain.com through smtp.rcn.com. Case by Case restrictions to this may be imposed as result of a compromised computer or host although in several of those cases enabling smtp auth will correct this.
If you are having a trouble sending email with your "From" setup as something other than rcn.com I would suggest enabling smtp auth and seeing if that helps with your problem.
We process a tone of email with customers doing just this scenerio so there is a possibility of specific 'one off' spam domains and what not. That being said if you want to message me some details around one of these 'dropped' emails we can research into where your mail is going.
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Bryan Laird
Director Product and Technology |
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NormanS
Premium,MVM
join:2001-02-14
San Jose, CA
·Pacific Bell - SBC
| reply to jsolo1
said by jsolo1 :Perhaps if all servers required authentication, port 25 could be left open. No credentials, no smtp. How would your email service relay agents move email if they were required to authenticate the connection? The basic idea is to separate message submission (which may require authentication) from mail transfer (which should not require authentication).
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Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum |
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jsolo1
join:2001-07-01
| Norman good point. My response was based on email submission, not transmission. You do bring up a good point though. Not sure how that would work. I imagine there may be a white list of sorts?
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Insanity is living in a state of disillusion. |
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negativeduck
Premium,VIP
join:2002-02-14
Centreville, VA
edit:
May 13th, @05:46PM
| Several mail hosts will not accept unauthenticated delivery requests from hosts that are NOT known isp's, or rather they specifically 'reject' or do not allow communication from a host that "appears" to be a dynamic IP pool connecting to their mail exchangers.. now this is a different scenario than say 'smtp' servers while fundamentally they same they like to serve different purposes.
IE if you run your own mail-server on a standard dynamically allocated IP there is a strong chance that you will never be able to deliver your email to alot of hosts. This is where smart-hosting and smart-relaying come in where you transfer your mail to a larger ISP for delivery to another large entity.
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Bryan Laird
Director Product and Technology |
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NormanS
Premium,MVM
join:2001-02-14
San Jose, CA
·Pacific Bell - SBC
| reply to jsolo1
Or read RFC 2476. That is the officially designated message submission port. Also, as a de facto standard, SMTPS (SMTP w/SSL) uses port 465.
Also read RFC 2821. SMTP does not require port 25, except for mail transfer.
If all E-mail Service Providers moved message submission to either the designated message submission port (RFC 2476), or even just any other port than port 25, it would be possible to reserve port 25 for mail transfer. Each gateway mail server can then decided for itself if a connecting mail host is trustworthy (allow), or not (deny).
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Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum |
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dehmmy
join:2004-11-20
Bethesda, MD
| reply to rcnman
said by rcnman :This is done in order to control outbound spam from zombies on the network. If you want to get around this block you can purchase a static IP that will open port 25. Not to be rude but that is exactly what I said in my earlier post.
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Why would a static ip open the port up when I can easily enable it in seconds.
** For purposes of protecting RCN and its policies, I will not discuss, reveal, or reply to any questions or inquiries regarding changing or modifying anything! **
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I'm just making a silly point. Actually I really have no reason I'm just rambling cause I'm on my ADD medications.. please don't fault me for that.
=)
jay |
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